Cubase 6 and Reason 4.0.1 connection...

I’m unable to link Cubase 6.0.4 w/ Reason. My Rewire works fine w/ Drumcore but can’t seem to
sync Reason. Any suggestions? Thanks

Also…I don’t have this problem w/ Cubase 5! ??? Cubase and Reason updated.
I’m running a newer imac. Help! Thanks